code: def _construct_sampler(self):
      pass
  
file_path: dowhy/dowhy/do_samplers/mcmc_sampler.py
imports: from typing import List
  import networkx
  import numpy
  import pymc3
  from dowhy import EstimandType
  from dowhy.do_sampler import DoSampler
label_desc: Use image node_id 11 for calling the McmcSampler obj's underlying member method code with example usage: obj._construct_sampler() without return types